41. Cincinnati cylindrical grinding machine Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Location: Cincinnati, Ohio Date: undated Format: Image Agent: unknown
42. Gear Shaper Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
43. Two Cincinnati super-service upright drills Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Location: Cincinnati, Ohio Date: undated Format: Image Agent: unknown
44. Acme multiple spindle automatic screw machine Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
45. Examples of screws, studs, and knobs made by the automatic screw machine Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
46. Automatic screw machine turning stock from 1/2 inch to 2 inches. Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Location: Providence, Rhode Island Date: undated Format: Image Agent: unknown
47. Gear hob from the Barber Coleman Company Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Location: Rockford, Illinois Date: undated Format: Image Agent: unknown
48. Gridley multiple spindle automatic machine Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
49. First milling machine, Eli Whitney, 1818 Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: 1818 Format: Image Agent: unknown
50. Universal multiple drill machine, drilling both horizontal and vertical Collection: Early 20th Century Engineering Lantern Slides Set: Transfer of skill Date: undated Format: Image Agent: unknown
